Which object has the least amount of kinetic energy? a car driving down a road a soccer ball rolling down a hill a bicycle locke
2 answers:
Answer:
A bicycle locked to a bike
Explanation:
The kinetic energy of an object when an object is moving. The mathematical expression for the kinetic energy of an object is given by :
Where
m is the mass of an object
v is the velocity of an object
First option : A car driving down a road, the car is moving i.e. it will possess kinetic energy.
Second option : A soccer ball rolling down a hill, the ball is moving i.e. it will possess kinetic energy
Third option : A bicycle locked to a bike, neither bicycle nor bike is moving i.e. it will not possess kinetic energy.
Fourth option : A satellite orbiting Earth, the satellite is moving i.e. it will possess kinetic energy.
Hence, "a bicycle locked to a bike " has least amount of kinetic energy.
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Answer:
Please refer to the figure.
Explanation:
The crucial point here is to calculate the enclosed current. If the current I is flowing through the whole cross-sectional area of the wire, the current density is
The current density is constant for different parts of the wire. This idea is similar to that of the density of a glass of water is equal to the density of a whole bucket of water.
So,
This enclosed current is now to be used in Ampere’s Law.
Here, represents the circular path of radius r. So we can replace the integral with the circumference of the path,
.
As a result, the magnetic field is
